The Doctor, Jamie and Zoe return to Earth and become embroiled in the schemes of Tobias Vaughn. They meet up with an old friend, Colonel (now Brigadier) Lethbridge-Stewart, and some old enemies, the Cybermen.
Patrick Troughton
as The Doctor
Frazer Hines
as Jamie McCrimmon
Wendy Padbury
as Zoe Heriot
Kevin Stoney
as Tobias Vaughn
Nicholas Courtney
as Brigadier Lethbridge-Stewart
Edward Burnham
as Professor Watkins
Sally Faulkner
as Isobel Watkins
Peter Halliday
as Packer/Cyberman Voice
Geoffrey Cheshire
as Tracy
Ian Fairbairn
as Gregory
Edward Dentith
as Major General Rutlidge
Clifford Earl
as Major Branwell
